Pentair Center Rod and Washer with Hardware 4072

The Pentair Center Rod and Washer 4072 with Hardware Replacement Kit (OEM Part #178814) is a heavy-duty structural anchoring component designed exclusively for the Pentair FullFloXF® 4000-Series High-Efficiency Vertical Grid Diatomaceous Earth (D.E.) Pool Filters, specifically the large-capacity F72 model.

Functional Overview

Constructed from high-tensile, corrosion-resistant stainless steel to survive the intensely chlorinated, high-pressure environment of a commercial or residential filter tank, this central rod acts as the primary spine for the entire internal filtration core. Measuring roughly 37 inches in length, the rod threads directly through the center axis of the grid nest, binding the heavy top distribution manifold tightly to the bottom support locator.

When the included compression hardware and specialized washer are tensioned down at the apex using the system's holding wheel, the rod locks all eight pleated D.E. grid elements into a perfectly rigid, parallel circular matrix. This physical compression ensures that individual grids cannot flex, shift, or rub against one another under heavy hydraulic pump surges or reverse-flow backwash cycles. By maintaining absolute structural alignment, it prevents water from finding gap paths around the elements, guaranteeing that all water is forced through the D.E. media bed for micro-particulate filtering down to 3 to 5 microns.

Weight and Shipping Profile

• Actual Product Weight: Approximately 1.0 to 1.3 pounds. While the metal rod itself is relatively slim, the structural density of the high-grade stainless steel and its anchoring washer give it notable physical heft.

• Packaged Shipping Weight: Typically scales at 2.0 to 3.0 pounds. Because of its rigid, elongated 37-inch profile, it must be shipped in an extended cardboard mailing tube or a long rectangular box packed with protective end-cushioning to keep the precision hardware threads from flattening or bending during transit.